KR20200040996A - Hvac of a vehicle - Google Patents

Abstract

Disclosed is an air conditioning system of a vehicle. The system comprises an indoor air conditioning circuit which heat-exchanges introduction air, which is introduced through an internal air inlet or an external air inlet, through an evaporator to make cooling air and supply the same into a vehicle compartment, and which heat-exchanges the introduction air through a heat exchanger to make warming air and supply the same into the vehicle compartment or discharge to the outside of the vehicle compartment. An engine cooling circuit is connected to the heat exchanger such that an engine coolant is used as a heating source. Accordingly, cooling performance of an EGR cooler is enhanced.

Description

Vehicle air conditioning system {HVAC OF A VEHICLE}

The present invention relates to an air conditioning system for a vehicle, and more particularly, to an air conditioning system for a vehicle combined with an EGR cooling circuit to improve EGR cooling performance.

In general, a vehicle is equipped with an air conditioning system (HVCA; Heating, Ventilation, and Air Conditioning) that can control the temperature and humidity inside the cabin to improve occupant's habitability.

The air conditioning system compresses the refrigerant by a compressor driven by receiving the power of the engine and supplies it to the condenser. The condenser condenses the refrigerant by forced blowing of a cooling fan, and then cools the refrigerant into a receiver dryer, an expansion valve, and After passing through the evaporator sequentially, it is circulated back to the compressor. During the circulation process of the refrigerant, indoor or outdoor air is exchanged with the refrigerant in the evaporator to reduce the temperature and then supplied to the interior of the vehicle to cool and dehumidify the interior of the vehicle.

In addition, inside the case of the air conditioning system, a heater core is installed adjacent to the evaporator to heat up part or all of the air passing through the evaporator through the heater core and then discharge it to the inside of the vehicle, thereby increasing the temperature inside the vehicle. It is controlled to a set temperature.

Although the heater core may use electricity as a heat source, it may be used as a heat source by being connected to an engine cooling circuit and receiving high-temperature cooling water that cools the engine.

On the other hand, the EGR (Exhaust Gas Cooler) cooler is a device that cools the EGR gas by exchanging the EGR gas with the engine coolant. When the temperature of the engine coolant increases as the vehicle continues to travel, the engine coolant and the EGR gas exchange only There is a limit to cooling the EGR gas.

Accordingly, there is a need for a technique for effectively cooling an engine's cooling water and EGR gas in a short time by using an air conditioning system of a vehicle to improve engine performance.

An embodiment of the present invention was devised in view of the above circumstances, and if necessary, cools the cooling performance of the EGR cooler by cooling the engine cooling water flowing into the EGR cooler with air conditioning air blown through a blow fan. It is intended to provide a vehicle air conditioning system that can be improved.

The air conditioning system of the vehicle according to an embodiment of the present invention heats the inflow air introduced through the inlet or outside air inlet through an evaporator to make cooling air and supplies it into the vehicle cabin, and heats the inlet air through heat exchanger to heat it And an indoor air conditioning circuit that creates air and supplies it to a vehicle interior or discharges it to the vehicle interior; An engine cooling circuit may be connected to the heat exchanger so that engine cooling water is used as a heat source.

The evaporator further includes a case having first and second discharge ports in which the heat exchanger is installed; Inside the case, a first door that selectively opens and closes the inner air inlet and the outer air inlet may be rotatably installed.

A second door that controls the flow rate of the inflow air flowing through the heat exchanger and the evaporator may be rotatably installed inside the case.

A third discharge port communicating with the outside of the vehicle cabin and a fourth discharge port communicating with the inside of the vehicle cabin are formed in the case so that the heated air heated through the heat exchanger can be selectively discharged to the outside of the vehicle cabin or supplied to the vehicle interior. A third door that selectively opens and closes the discharge port and the fourth discharge port may be rotatably installed in the case.

The heat exchanger is connected to the engine through a cooling water supply passage to receive the engine cooling water, and the heat exchanger communicates with the engine through a cooling water return passage to return the engine cooling water heat-exchanged with the incoming air in the heat exchanger to the engine. Can be connected.

An EGR cooler that cools EGR gas is connected to the cooling water supply passage through a first branch passage to receive the engine cooling water through the cooling water supply passage; The EGR cooler may be connected to the cooling water return passage and a second branch passage to return the cooling water heat-exchanged with the EGR gas in the EGR cooler.

First and second valves for adjusting the flow direction of the cooling water may be installed in each branch portion of the first branch passage and the second branch passage.

A temperature sensor that detects the temperature of the cooling water flowing into the EGR cooler through the first branch channel is installed in the first branch channel; A cooling water pump for pumping and supplying the cooling water may be installed in the second branch passage.

In the first driving mode in which the inside of the vehicle cabin is higher than the target temperature of the occupant and the circulation of the bet and the cooling of the room and the cooling of the EGR cooler are performed, the first door is rotated toward the outside air inlet to block the outside air inlet, The bet inlet is open; The second door is rotated between the heat exchanger and the evaporator according to a difference between the temperature inside the vehicle compartment and the target temperature; The third door is rotated to open the third outlet and block the fourth outlet; The first and second valves may simultaneously block the flow path toward the engine, and the flow path may be opened toward the EGR cooler.

In the second operation mode in which the indoor temperature and the target temperature are similar to the bet circulation, cooling and heating, and EGR cooling, the first door is rotated toward the outside air inlet to block the outside air inlet, and the bet inlet is Open; The second door is rotated between the heat exchanger and the evaporator according to a difference between the temperature inside the vehicle compartment and the target temperature; The third door is rotated toward the third outlet, the third outlet is blocked, and the fourth outlet is opened; The first and second valves may simultaneously block the flow path toward the engine and open the flow path toward the EGR cooler.

In the third operation mode in which the indoor temperature is lower than the target temperature of the user so that circulation and heating of the bet is performed, the first door is rotated toward the external air inlet, the external air inlet is blocked, and the internal air inlet is opened; The second door is rotated toward the evaporator to block air inflow to the evaporator, and the inflow air flows only toward the heat exchanger; The third door is rotated toward the third outlet, the third outlet is blocked, and the fourth outlet is opened; The first and second valves may simultaneously operate to block the flow path toward the EGR cooler and to open the flow path toward the engine.

When the temperature in the interior of the vehicle is raised similar to the target temperature by the execution of the third driving mode, the second driving mode may be switched.

This mode is used for indoor partial cooling and dehumidification, and the temperature inside the vehicle room is higher than the target temperature, and in the fourth operation mode in which outdoor air circulation and indoor cooling and EGR cooling in which indoor partial cooling and dehumidification are required are performed, the first door Is rotated toward the bet inlet and the bet inlet is blocked while the outside air inlet is opened; After being rotated at a predetermined angle of the second door, a part of the inflow air is cooled through the evaporator, and then introduced into the vehicle compartment to simultaneously cool and dehumidify, and the remaining air flows toward the heat exchanger to exchange the heat exchanger. Cooling of the cooling water is achieved in; The third door is rotated to open the third outlet, while blocking the fourth outlet; The first and second valves may simultaneously block the flow path toward the engine, and the flow path may be opened toward the EGR cooler.

In the fifth driving mode used in harsh driving conditions, such as towing or backing of a vehicle, the first door is rotated toward the bet inlet and the outside air inlet is opened on a surface where the bet inlet is blocked; The second door is rotated toward the evaporator to block air inflow to the evaporator, while flowing only to the heat exchanger; The third door is rotated toward the fourth outlet to block the fourth outlet while the third outlet is opened; The first and second valves may simultaneously operate to block the flow path toward the EGR cooler and to open the flow path toward the engine.

According to the air conditioning system of the vehicle according to an embodiment of the present invention, the cooling water of the EGR cooler is separately cooled from the engine cooling circuit using the indoor air conditioning circuit to match the engine operating conditions and achieve the target cooling temperature of the EGR gas. Variable operation is possible.

In addition, since the radiator disposed on the front of the vehicle can be used solely for the engine cooling circuit, the engine cooling performance can also be improved, the size of the radiator can be reduced to improve the layout of the engine room, and it is possible to respond to pedestrians and low-speed collisions. It can also be used as a space.

1 is a block diagram of a vehicle air conditioning system according to an embodiment of the present invention.
2 to 6 are explanatory views of a driving mode of a vehicle air conditioning system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail based on the attached exemplary drawings.

Referring to Figure 1, the vehicle air conditioning system according to an embodiment of the present invention, the indoor air conditioning circuit 10 for controlling the temperature inside the vehicle by heating or cooling the outdoor or outdoor air inside the vehicle to blow the air inside the vehicle interior , It is connected to heat exchange with each other through the engine cooling circuit 50 and the heat exchanger to cool the engine by circulating the cooling water.

The air conditioning circuit 10 includes a case 11 in which a suction space 12 having a predetermined size is formed therein, and on one side of the case 11, the outside air inlet port through which the outside air flows into the suction space 12 ( 13) and bet inlets 14 that allow the inside air of the vehicle interior to flow into the suction space 12 may be provided.

A blower fan 15 that sucks air through the outside air inlet 13 or the inside air inlet 14 and supplies it to the suction space 12 may be installed at the inlet side of the suction space 12.

In addition, a first door 16 for selectively opening and closing the outside air intake 13 and the inside air intake 14 is hinged to a predetermined portion inside the case between the outside air intake 13 and the inside air intake 14. It can be installed rotatably through the medium.

When the first door 16 is rotated to one side to block the outside air inlet 13, the bet inlet 14 is opened so that the bet can be introduced into the suction space 12, and the first door 16 is burned. When the inside air inlet 14 is blocked by rotating to the side, the outside air inlet 13 is opened, and outside air may be introduced into the suction space 12.

Two first and second discharge ports 17a and 17b may be provided inside the suction space 12. The first discharge port 17a communicates with the inside of the vehicle compartment, and air conditioning air may be introduced into the vehicle compartment through the first discharge port 17a.

An evaporator 18 may be installed at the first discharge port 17a. The evaporator 18 serves to cool the air-conditioning air by receiving refrigerant and exchanging heat with air-conditioning air passing through the evaporator 18. That is, the air introduced into the suction space 12 is cooled by heat exchange with a refrigerant in the evaporator 18 and then blown into the vehicle interior to cool the interior of the vehicle interior.

A heat exchanger 19 may be installed at the second discharge port 17b. The heat exchanger 19 receives the cooling water of the engine and heats the air conditioning air by heat exchange with the air conditioning air passing through the heat exchanger 19.

The air conditioning air heated through the heat exchanger 19 through the second discharge port 17b is discharged to the outside of the vehicle cabin through the third discharge port 20 connected to the outside of the vehicle cabin, or the fourth discharge port connected to the interior of the vehicle vehicle ( 21) can be introduced into the vehicle interior to heat the interior of the vehicle interior. That is, the second discharge port 17b is in communication with the third discharge port 20 and the fourth discharge port 21.

On the other hand, between the heat exchanger 19 and the evaporator 18, a second door 22 is rotatably installed via a hinge, and according to the rotation angle of the second door 22, the suction space 12 ) Can be made to flow into the heat exchanger 19 or the evaporator 18 only, the outside air or the inside introduced into the heat exchanger 19 and the evaporator 18 can be simultaneously flowed. Can be adjusted.

In addition, a third door 23 is hinged inside the case 11 to control the flow rate of the air conditioning air heated through the heat exchanger 19 to the third discharge port 20 and the fourth discharge port 21. It can be installed to be able to rotate through the medium.

That is, according to the rotation angle of the third door 23, the air conditioning air discharged through the heat exchanger 19 is discharged to the outside of the vehicle cabin through the third discharge port 20, or the fourth discharge port 21 It is discharged to the interior of the vehicle cabin to be heated inside, and the flow rate of the air conditioning air flowing through the third discharge port 20 and the flow rate of the air conditioning air flowing through the fourth discharge port 21 can also be adjusted.

The engine cooling circuit 50 cools the coolant by heat-exchanging coolant with a water jacket 52 formed to allow coolant to flow around a plurality of cylinders of the engine 51 that generates power by burning fuel. A cooling water flow control valve 54, such as a thermostat, provided between the radiator 53, the radiator 53 and the water jacket 52 of the engine 51 to control the flow direction of the cooling water, and pumping the cooling water The water pump 55 for forcibly circulating may be provided.

The water jacket 52 is connected to the cooling water inlet of the heat exchanger 19 through the cooling water supply passage 61, and the heated cooling water that cools the engine 51 is supplied to the heat exchanger 19, and the heat exchanger (19) can be used as a heat source.

In addition, one end of the cooling water return passage 62 is connected to the cooling water outlet of the heat exchanger 19, and the other end of the cooling water return passage 62 is connected to the inlet of the flow control valve 54, and in the heat exchanger 19 Cooling water that has been heat-exchanged and cooled may be introduced into the flow control valve 54.

The first branch passage 71 branched from the cooling water supply passage 61 is connected to the inlet of the EGR cooler 70, so that the cooling water that cools the engine 51 is supplied to the EGR cooler 70 so that the EGR cooler 70 ) To cool the recirculated exhaust gas by exchanging heat with the recirculated exhaust gas.

The cooling water outlet of the EGR cooler 70 is connected to the cooling water return passage 62 through a second branch passage 72 branched from the cooling water return passage 62, and the cooling water cooling the EGR cooler 70 is the heat exchange The coolant passing through the engine 19 and returning to the engine side is combined with the cooling water to return to the engine side.

A temperature sensor 80 for measuring the coolant temperature flowing into the EGR cooler 70 through the first branch passage 71 may be installed in the first branch passage 71,

A first valve 81, for example, a three-way valve is installed at the branching portion of the first branch passage 71 to control the flow direction of the coolant.

A second valve 82, for example, a three-way valve is also installed in the branch portion of the second branch flow path 72 to control the flow direction of the coolant.

Accordingly, it is possible to control the flow of cooling water discharged from the engine 51 through the first valve 81 to the EGR cooler 70 and the heat exchanger 19, and through the second valve 82 The return of the coolant passing through the EGR cooler 70 to the engine and recirculation to the heat exchanger can be controlled.

In addition, a cooling water pump 83, for example, an electric water pump, is installed in the second branch flow passage 72 to forcibly circulate the cooling water.

The temperature sensor 80 is connected to the input terminal of a controller (not shown), the controller detects the coolant temperature through the temperature sensor 80, the coolant pump 83 and the first and second valves 81 and 82 Is connected to the output terminal of the controller, and receives the control signal from the controller to control its operation.

The air conditioning system of a vehicle according to an embodiment of the present invention configured as described above may be operated in a plurality of driving modes as follows.

The first driving mode illustrated in FIG. 2 is a mode used when cooling in the vehicle interior is required, for example, in summer, and is operated when the temperature inside the vehicle is significantly higher than a target temperature set by the passenger. It is a mode in which bet circulation + indoor cooling + EGR cooling is performed.

The first door 16 is rotated toward the outside air inlet 13 to block the outside air inlet 13, and the inside air inlet 14 is opened, so that the inside air inside the vehicle compartment is blown into the suction space 12 of the air conditioning case 11 It flows into the operation of the fan (15).

Depending on the rotation angle of the second door 22, a part of the air sucked into the suction space 12 is cooled through the evaporator 18 and then flows into the interior of the vehicle, cooling the interior of the vehicle, and the remaining air It is made to flow toward the heat exchanger 19 to cool the cooling water through the heat exchanger 19.

The third door 23 is rotated to open the third discharge port 20, and by blocking the fourth discharge port 21, the air heated by heat exchange with the cooling water through the heat exchanger 19 is the third discharge port 20 ) Is discharged to the outside of the vehicle cabin.

On the other hand, the first and second valves 81 and 82 simultaneously block the flow path toward the engine, and the flow path is opened toward the EGR cooler 70 so that the flow path exists between the EGR cooler 70 and the heat exchanger 19. The cooling water to be circulated only through the closed circuit between the EGR cooler 70 and the heat exchanger 19 by the operation of the cooling water pump 83.

Therefore, the cooling water of the EGR cooler 70 is cooled by heat exchange with cooling air circulating in the room, so that the cooling performance of the EGR cooler is improved, and the temperature of the EGR gas flowing into the engine through the EGR cooler 70 is also appropriately reduced. As a result, the output performance of the engine can be improved.

The rotation angles of the first, second and third doors 16, 22 and 23 can be adjusted by the operation of the motor by the control signal of the controller.

The second operation mode illustrated in FIG. 3 is a mode operated when the indoor temperature and the target temperature are similar, and is a mode in which bet circulation + cooling and heating + EGR cooling are performed.

In the first operation mode, the third door 23 is rotated toward the third discharge port 20 to block the third discharge port 20 and open the fourth discharge port 21 to pass through the heat exchanger 19 Thus, the heated warm air and the cold air cooled through the evaporator 18 flow into the interior of the vehicle at the same time, thereby setting the temperature inside the vehicle to the target temperature. At this time, the rotation angle of the second door 22 is adjusted according to the control signal of the controller so that the flow rate of air flowing into the heat exchanger 19 and the flow rate of air flowing into the evaporator 18 can be appropriately adjusted.

Of course, in the second operation mode, the EGR cooling performance is improved as in the first operation mode.

The third operation mode illustrated in FIG. 4 is an operation mode used when emergency heating is required in winter when the room temperature is lower than a user's target temperature, for example, bet circulation + emergency heating mode.

The first door 16 is rotated toward the outside air inlet 13 to block the outside air inlet 13, and the inside air inlet 14 is opened, so that the inside air inside the vehicle compartment is blown into the suction space 12 of the air conditioning case 11 It flows into the operation of the fan (15).

The second door 22 is rotated toward the evaporator 18 to block the inflow of air to the evaporator 18, and allows air to flow only toward the heat exchanger 19.

The third door 23 is rotated toward the third discharge port 20 to block the third discharge port 20, and the fourth discharge port 21 is opened to heat through heat exchange with the cooling water through the heat exchanger 19 The discharged air is discharged into the vehicle interior through the fourth discharge port 21 to heat the interior of the vehicle interior.

On the other hand, the first and second valves 81 and 82 simultaneously block the flow path toward the EGR cooler 70, and the flow path toward the engine is operated to open, so that the high-temperature coolant that cooled the engine cools toward the EGR cooler 70. Is not introduced, but only flows toward the heat exchanger 19, thereby rapidly heating the indoor air with cooling water of the engine to increase the temperature.

On the other hand, when the temperature in the interior of the vehicle is raised similar to the target temperature, the second operation mode is switched to cool the EGR cooler 70 again.

The fourth driving mode illustrated in FIG. 5 is, for example, a mode used for indoor partial cooling and dehumidification, a mode operated when the temperature inside the vehicle room is significantly higher than a target temperature set by a passenger, and the external air circulation + This mode is for indoor cooling + EGR cooling.

The first door 16 is rotated toward the bet inlet 14 to block the bet inlet 14, and the outside air inlet 13 is opened, so that outside air in the vehicle compartment is blown into the suction space 12 of the air conditioning case 11 It flows in according to the operation of the fan (15).

Depending on the rotational angle of the second door 22, a part of the air sucked into the suction space 12 is cooled through the evaporator 18 and then introduced into the vehicle compartment to simultaneously cool and dehumidify, and the rest The air flows toward the heat exchanger 19 to cool the cooling water in the heat exchanger 19.

The third door 23 is rotated to open the third discharge port 20, and by blocking the fourth discharge port 21, the air heated by heat exchange with the cooling water through the heat exchanger 19 is the third discharge port 20 ) Is discharged to the outside of the vehicle cabin.

On the other hand, the first and second valves 81 and 82 simultaneously block the flow path toward the engine, and the flow path is opened toward the EGR cooler 70 so that the flow path exists between the EGR cooler 70 and the heat exchanger 19. The cooling water to be circulated only through the closed circuit between the EGR cooler 70 and the heat exchanger 19 by the operation of the cooling water pump 83.

Therefore, the cooling water of the EGR cooler 70 is cooled by heat exchange with cooling air circulating in the room, so that the cooling performance of the EGR cooler is improved, and the temperature of the EGR gas flowing into the engine through the EGR cooler 70 is also appropriately reduced. As a result, the output performance of the engine can be improved.

The fifth driving mode illustrated in FIG. 6 is a driving mode used in harsh driving conditions such as towing or backing of a vehicle.

The first door 16 is rotated toward the bet inlet 14 to block the bet inlet 14, and the outside air inlet 13 is opened, so that the inside air of the vehicle compartment is blown into the suction space 12 of the air conditioning case 11 It flows into the operation of the fan (15).

The second door 22 rotates toward the evaporator 18 to block air inflow to the evaporator 18, and allows air inside the suction space 12 to flow only toward the heat exchanger 19.

The third door 23 is rotated toward the fourth discharge port 21 to block the fourth discharge port 21, and the third discharge port 20 is opened to heat through heat exchange with the cooling water through the heat exchanger 19 The air is discharged through the third discharge port 20 to the outside of the vehicle cabin.

On the other hand, the first and second valves 81 and 82 simultaneously block the flow path toward the EGR cooler 70, and the flow path toward the engine is operated to open, so that the high-temperature coolant that cooled the engine cools toward the EGR cooler 70. Does not flow, but only flows toward the heat exchanger 19.

Accordingly, the cooling water of the engine is cooled by the radiator 53 and also cooled by the heat exchanger 19, and double cooling is performed, so that the cooling water cooling efficiency of the engine can be improved.

As described above, the present invention has been described through limited embodiments and drawings, but the present invention is not limited thereto, and the technical idea of the present invention and those described below by those skilled in the art to which the present invention pertains Various modifications and variations are possible within the equal scope of the claims.

10: indoor air conditioning circuit
50: engine cooling circuit
11: case
12: suction space
13: outside air inlet
14: bet inlet
15: blower fan
16: First door
17a, 17b: outlet
18: evaporator
19: heat exchanger
20: 3rd outlet
21: 4th outlet
22: second door
23: Third door
50: engine cooling circuit
51: engine
52: water jacket
53: radiator
54: flow control valve
55: water pump
61: cooling water supply passage
61: cooling water return passage
70: EGR cooler
71: Euro in the first quarter
72: 2nd Quarter
80: temperature sensor
81, 82: valve
83: coolant pump

Claims (14)

The inlet air introduced through the inlet or the outside air inlet is heat-exchanged through an evaporator to make cooling air and supplies it to the inside of the vehicle, and the inlet air is exchanged through the heat exchanger to make heating air to supply it to the inside of the vehicle or discharge it outside the vehicle An indoor air conditioning circuit;
An air conditioning system for a vehicle in which an engine cooling circuit is connected to the heat exchanger so that engine cooling water is used as a heat source. According to claim 1,
The evaporator and the heat exchanger further comprises a case having a first and second discharge ports are respectively installed;
The inside of the case, the air conditioning system of the vehicle, characterized in that the first door to selectively open and close the air inlet and the air inlet is installed. According to claim 2,
An air conditioning system for a vehicle, characterized in that a second door for adjusting the flow rate of the inflow air flowing through the heat exchanger and the evaporator is rotatably installed inside the case. According to claim 3,
A third discharge port communicating with the outside of the vehicle cabin and a fourth discharge port communicating with the interior of the vehicle cabin are formed in the case so that the heated air heated through the heat exchanger can be selectively discharged to the outside of the vehicle cabin or supplied to the vehicle interior. A vehicle air conditioning system, characterized in that a third door that selectively opens and closes the discharge port and the fourth discharge port is rotatably installed in the case. According to claim 4,
The heat exchanger is connected to the engine through a cooling water supply passage to receive the engine cooling water,
An air conditioning system for a vehicle, characterized in that the heat exchanger is connected to the engine through a cooling water return passage to return the engine cooling water heat-exchanged with the incoming air in the heat exchanger to the engine. The method of claim 5,
An EGR cooler that cools EGR gas is connected to the cooling water supply passage through a first branch passage to receive the engine cooling water through the cooling water supply passage;
An air conditioning system for a vehicle, characterized in that the EGR cooler is connected through the cooling water return passage and a second branch passage to return the cooling water heat-exchanged with the EGR gas in the EGR cooler. The method of claim 6,
Air conditioning system for a vehicle, characterized in that the first and second valves for controlling the flow direction of the cooling water are installed in each branch of the first and second branch passages. The method of claim 7,
A temperature sensor that detects the temperature of the cooling water flowing into the EGR cooler through the first branch channel is installed in the first branch channel;
An air conditioning system for a vehicle, characterized in that a cooling water pump for pumping and supplying the cooling water is installed in the second branch passage. The method of claim 8,
In the first driving mode in which the bet circulation, the indoor cooling, and the cooling of the EGR cooler are performed when the temperature inside the vehicle cabin is higher than the target temperature of the occupant,
The first door is rotated toward the outside air inlet to block the outside air inlet, and the inside air inlet is opened;
The second door is rotated between the heat exchanger and the evaporator according to a difference between the temperature inside the vehicle compartment and the target temperature;
The third door is rotated to open the third outlet and block the fourth outlet;
The first and second valves simultaneously block the flow path toward the engine, and the air conditioning system of the vehicle is characterized in that the flow path is opened toward the EGR cooler. The method of claim 8,
In the second operation mode in which bet circulation, cooling and heating, and EGR cooling are performed when the indoor temperature and the target temperature are similar,
The first door is rotated toward the outside air inlet to block the outside air inlet, and the inside air inlet is opened;
The second door is rotated between the heat exchanger and the evaporator according to a difference between the temperature inside the vehicle compartment and the target temperature;
The third door is rotated toward the third outlet, the third outlet is blocked, and the fourth outlet is opened;
The first and second valves simultaneously block the flow path toward the engine, and the air conditioning system of the vehicle is characterized in that the flow path is opened toward the EGR cooler. The method of claim 8,
In the third operation mode, in which the indoor temperature is lower than the target temperature of the user, and bet circulation and heating are performed,
The first door is rotated toward the outside air inlet, the outside air inlet is blocked, and the inside air inlet is opened;
The second door is rotated toward the evaporator to block air inflow to the evaporator, and the inflow air flows only toward the heat exchanger;
The third door is rotated toward the third outlet, the third outlet is blocked, and the fourth outlet is opened;
The first and second valves simultaneously block the flow path toward the EGR cooler, and the air path toward the engine is operated to open the air conditioning system of the vehicle. The method of claim 11,
An air conditioning system for a vehicle, characterized in that when the temperature inside the vehicle compartment is raised to a target temperature by the execution of the third driving mode, the second driving mode is switched. The method of claim 8,
In a mode used for indoor partial cooling and dehumidification, the temperature inside the vehicle room is higher than the target temperature, and in the fourth operation mode in which outdoor air circulation and indoor cooling and EGR cooling in which indoor partial cooling and dehumidification are required are performed,
The first door is rotated toward the bet inlet and the bet inlet is blocked while the outside air inlet is opened;
After being rotated at a predetermined angle of the second door, a part of the inflow air is cooled through the evaporator, and then introduced into the vehicle compartment to simultaneously cool and dehumidify, and the remaining air flows toward the heat exchanger to exchange the heat exchanger. Cooling of the cooling water is achieved in;
The third door is rotated to open the third outlet, while blocking the fourth outlet;
The first and second valves simultaneously block the flow path toward the engine, and the air conditioning system of the vehicle is characterized in that the flow path is opened toward the EGR cooler. The method of claim 8,
In the fifth driving mode used in harsh driving conditions, such as towing or backing of a vehicle,
The first door is rotated toward the bet inlet and the outside air inlet is opened on a surface where the bet inlet is blocked;
The second door is rotated toward the evaporator to block air inflow to the evaporator, while flowing only to the heat exchanger;
The third door is rotated toward the fourth outlet to block the fourth outlet while the third outlet is opened;
The first and second valves simultaneously block the flow path toward the EGR cooler, and the air conditioning system of the vehicle is operated to open the flow path toward the engine.

Images